Question

9x-7y=8 5x-2y=12 metodos de iguialacion​

Answer 1

Respuesta:

x = 4

y = 4

Explicación paso a paso:

9x-7y=8 donde 9x = 8+7y

x= (8+7y)/9

5x-2y=12 donde 5x = 12 + 2y

x = (12+ 2y)/5

como x = x entonces:

(8+7y)/9 = (12+ 2y)/5

40 + 35y = 108 + 18y

35y-18y = 108 - 40

17y = 68

y = 68/17

y = 4

x = (12+2y)/5 = (12+2*4)/5 = 20/5

x = 4